Bar which cannot be sawed through.



N0. 763,651- 1 PATENTBD JUNE 28, 1904. P. D. ZIEGLER.

BAR WHICH CANNOT BE SAWED THROUGH. A

APPLICATION FILED RAUS. 5, 1903. N0 MODEL.

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Inf/enf() B50? nomi v erence is had to the accompanying drawings,

UNITED STATESv Patented June 28, 1904.

PATENT OFFICE.

BAR WHICH CANNOT BE SAWED THROUGH.v

SPECIFICATION formngipart of Letters Patent No. 763,651, dated June 28, 1904.

Application led August 5, 1903.

To a/Z/ zul/1,0m, it may concern.' l

Be it known that I, PERRY D. ZIEGLER, a citizen of the United States, residing at Ashtola, in the county of Somerset and State of Pennsylvania, have invented a new and useful Improvement in Bars Which Cannot be Sawed or Cut Through, of which improvement the following is a specification.

This invention relates to certain new and useful improvements in bars, and relates more particularly to a bar which cannot be sawed or cut through.

The object'of this invention is to provide a bar for use in connection with prison-cells, windows or doors, and safety-vaults, whereby the same may not be sawed or cut, thereby providing a grating which will be proof against burglars or other persons criminally inclined. r

With the above and other objects in view the invention consists in the novel construction, combination, and arrangement of parts, to be hereinafter more fully described, and specifically pointed out in the claim.

In describing the invention in detail referforming a part of this specification, and wherein like numerals of reference indicate like parts throughout the several views, in which- Y Figure l is a sectional plan view of my improved bar. Fig. 2 is a sectional elevation taken on the line 2 2 of Fig. l. Fig. 3 is a sectional plan view of a modified form of bar. Fig. 4 is a similar view of another form of bar, and Fig. 5 is a sectional elevation of Fig. 4.

In carrying out my invention I take a metallic bar of any suitable material, preferably iron or steel, and in said bar l adjacent to its corners I provide the longitudinal apertures 2. In the case of a round bar I provide a plurality of apertures 2 adjacent to its periphery, and, if desired, as an extra precaution I may provide one or more holes 2.. The bar having been formed as described, I pour or force molten glass or the like 3into said aperl Serial No. 168,310. (No model.)

tures, and after the same has cooled it would be impossible to saw through the bar for the reason that the saw would not cut the glass and only a partial fracture of the bar could be obtained. It will be noted that while only a small proportion of the area will be taken up by the glass lling it would be impossible to saw into the bar for any great distance without the saw coming into contact with the same. appearance of the bar would not disclose the inside structure, and thus in the case of prison any attempts to sever the bar, while proving futile, would leave a means of detecting the same.

While I have described the several apertures as being filled with glass, it is obvious that various other materials might be used. Carborundum or the like might also be used as a filling material, if desired.

While Ihave herein described my invention in detail, it will be obvious that the bar might be of any shape in cross-section and might have any number of holes desirably arranged without departing from the general spirit of my invention.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

A bar of the type set forth having a plurality of longitudinal circular apertures formed therethrough, and located adjacent the outer surface of the bar, and a filling material of glass completely occupying the space formed by the said apertures, whereby said bar will be protected irrespective of the point attacked with a saw or the like. v

In testimony whereof I have hereunto signed my name in the presence of two subscribing witnesses.

PERRY D. ZIEGLER.

In presence of- C. L. BABcocK, L. BouLToN.

It will also be noted that the outward 

